<![CDATA[Multimedia content security has become a challenge as the distribution and manipulation of digital files become increasingly easy. This study aims to implement a digital signature based on the Rivest–Shamir–Adleman (RSA) algorithm to support the verification of multimedia content authenticity and integrity. The methods include problem identification, model design, implementation of the SHA-256 hash function, signature generation using a private RSA key, and verification using a public key. Testing was designed for six multimedia formats, namely JPEG, PNG, MP3, WAV, MP4, and AVI, using parameters including file size, hash value changes, verification status, signing time, verification time, and verification success rate. Based on the testing scenario, file sizes ranged from 2.50 to 82.70 MB. Signing time ranged from 0.012 to 0.038 seconds, with an average of 0.0218 seconds, while verification time ranged from 0.004 to 0.010 seconds, with an average of 0.0063 seconds. Testing across 12 conditions, consisting of six original files and six modified files, yielded a verification success rate of 100%, based on the assumption that all results matched the expected conditions. Hash value changes were used to identify changes in file content after manipulation. These results illustrate the potential of RSA for supporting multimedia integrity verification. However, empirical testing is still required to validate all values and objectively assess system performance.]]>
