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Today, data security is a major problem concerning organizations and indi-
viduals. The confidentiality of information is associated with using reliable and robust
encryption algorithms in systems. Cyber-attacks on data and systems have become
prevalent and sophisticated, and are increasing rapidly; hence, the need for developing
robust encryption algorithms is crucial nowadays. This paper proposes a new encryption
algorithm using dynamic symmetric key cryptography to encrypt text files. It utilizes
a secret key for encryption and decryption processes, where the key’s length is varied
depending on the text size. This presented approach gives a trade-off between speed
and security, making it suitable for various applications, such as secur
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