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    <keywords>Seguridad computacional, proteccion de datos, criptografia, confidencialidad, computer security, data protection, cryptography, confidentiality</keywords>
    <abstract>The arise of communication networks, particularly Internet, has paved the way for new chances in information interchange. There are also greater menaces to information security. In this case the creation of several mechanisms to guard the confidentiality and authenticity of electronic documents is necessary. All of this is part of a new technology called cryptography. Information security topics are discussed with emphasis in the cryptographic variants: symetrical and asymetrical. Some schemes for the management of public and private keys: RSA and PSP are exposed. Finally the limitations of some solutions offered by this new discipline are provided.</abstract>
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    <referencetext>Aneiro Rodríguez LO. Elementos de arquitectura y seguridad informática. La Habana: Instituto Superior Politécnico &quot;Eduardo García Delgado&quot;, 2000. 

Organization for Economic Cooperation and Development. Guidelines for security of information systems. New York: Lippincott; 1992. 

National Institute of Standard and Technology. General Principles for Information Systems Security Policies. New York: Mc Graw Hill, 1996. 

Mendvil I. El ABC de los documentos electrónicos seguros. Disponible en: http://www.criptored.upm.es/guiateoria/gt_m163a.htm Acceso: 20 de enero del 2003. 

Angel Angel JJ. Criptografía para principiantes. Disponible en: http://www.htmlweb.net/seguridad/cripto_p/cripto_princ_1.html Acceso: 15 de enero del 2003. 

Bradanovic T. Algo sobre Criptografía. Disponible en: http://www.vcd.cl/tombrad/pcasual/ayuda5.html Acceso: 20 de enero del 2003. 

Menezes AJ, Oorschot PC, Vanstone SA. Handbook of applied Cryptography. Disponible en: http://www.cacr.math.uwaterloo.ca/hac/ Acceso: 10 de febrero del 2003[ STANDARDIZEDENDPARAG]

American National Standards Institute. ANSI X3.92 American National Standard- Data Encryption Algorithm. Washington DC: American National Standards Institute,1981. 

Federal Information Processing Standards. Data Encryption Standard ( FIPS 46-2). Disponible en: http://www.itl.nist.gov/fipspubs/fip46-2.htm Acceso: 20 de febrero del 2003. 

American National Standards Institute. ANSI X3.106 American National Standard - Data Encryption Algorithm Modes of Operation. Washington DC:American National Standards Institute,1983. 

Federal Information Processing Standards. FIPS 81. DES modes of operation. Disponible en: http://www.itl.nist.gov/fipspubs/fip81.htm Acceso: 24 de febrero del 2003. 

ISO. ISO 8372 Information processing - Modes of operation for a 64-bit block cipher algorithm. Geneva: ISO, 1997. 

Hispasec Sistemas. PGP Enterprise: Componentes de PGP Enterprise Security. Seguridad de comunicación mundial con PGP. Disponible en: http://www.hispasec.com/directorio/laboratorio/articulos/PGPEnterprise/03.html Acceso: 6 de febrero del 2003.</referencetext>
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